Question about Toyota Cars & Trucks
Had ac check done at Pep Boys. They said no power to compressor. Could this be from a relay going out? If so should the ac compressor control relay and the mg clt both be changed or just one?
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Posted on Jan 02, 2017
it is located in the engine compartment fuse / junction box it is on the drivers side then cover to the box will show you witch one it is ( the relay will be white in color)
Posted on May 30, 2009
The follwing is a cut and paste from a service bulletin:
Bulletin No.: 461202
Date: May, 1994
A/C CONTROL HEAD FLASHES OR ERRATIC OPERATION OF A/C CONTROLS (POLISH
1988-94 CHEVROLET AND GMC TRUCK C/K MODELS
1990-94 CHEVROLET AND GMC TRUCK TOPKICK/KODIAK MODELS WITH C60 OR C69 AIR
A/C Control Head flashes, performs erratically or malfunctions.
Light surface corrosion on the Control Head terminals.
Remove the A/C Control Head and while holding the unit with the terminal
cavity down (toward the floor) so no particles will fall inside on the
circuit boards, polish the terminals on both sides of the cavity with a lead
pencil pink eraser. Do not use an ink eraser or other abrasive such as a
small wire brush or sandpaper, etc. Doing so will remove the terminal
coating and degrade the contact surface.
Performing this procedure, in many cases, will make replacing the Control
Head unnecessary. Using this procedure in conjunction with the A/C circuit
diagnosis found in the Electrical Diagnosis Manual and especially before
replacing a Control Head for any reason is recommended.
After polishing the Control Head terminals, but before reconnecting, check
for proper terminal contact as described in the applicable electrical
diagnosis manual. If contact is good, apply dielectric grease (P/N 12345579)
to the harness connector terminals. Please do not apply grease to the
Posted on Jun 30, 2009
It is the Magmetic clutch relay for your A/C - if your AC light is blinking and you have no AC change this relay - common problem in this model - to test the relay switch it with one of the other relays next to it and try the AC (the relays are ina black box on the drivers side under the hood behind the battery)
Posted on May 03, 2010
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